Number Identification Supplementary Services: Calling Name Identification Presentation - Series I: Integrated Services Digital Network; Service Capabilities - Supplementary Services in ISDN Study Group 1; 17 pp
PU-T Recommendation 1.251.9 was prepared by ITU-T Study Group 1 (1993-1996) and was
approved under the WTSC Resolution No 1 procedure on the 19th of July 1996.